نوع مقاله : مقاله پژوهشی
نویسنده
استادیار، گروه مکانیک، دانشکده فنی و مهندسی، دانشگاه اراک، اراک، ایران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسنده [English]
Phononic crystals are periodic composite materials that are formed by the alternating repetition of one (or more) inclusion in a host. Duo to their band gap characteristic and their ability to manage the propagation of elastic waves, many researches have been devoted to this subject in recent years. This article investigates the propagation of in-plane mode of elastic wave in alumina-epoxy composite. The effect of inclusion shape on composite band gap has been investigated by finite element method with the help of Comsol software. The lattice is assumed to be square. In order to verify the results, first, the band structure of phononic crystal with a circular inclusion shape was obtained and compared with that of plane wave expansion method and experimental results. Then, the band structure of phononic crystals with triangular, square, regular pentagonal, regular hexagonal, regular heptagonal, and regular octagonal inclusion shapes have been obtained. The obtained results showed that the band gap of the phononic crystal with the triangular inclusion shape (frequency range 47.3 to 66.1 and 79.9 to 90.3 kHz) is wider compared to other studied inclusion shapes.
کلیدواژهها [English]
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